The causes of chest congestion: First, weather, environment and psychological reasons, such as hot and stuffy weather, poor indoor air circulation, excessive stress and emotional excitement can cause chest tightness and shortness of breath. Second, most of the elderly are due to the degeneration of heart function and lung function, resulting in chest tightness. Third, pregnant women, women during pregnancy because of the growing uterus, will lead to chest tightness. Fourth, diseases, such as coronary heart disease, heart failure, bronchitis, lung disease, digestive system diseases, etc. can lead to chest tightness, or even difficulty breathing and chest pain. If these conditions occur, you should go to the hospital for examination in time.